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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b3637b91947aa1ac9f66824711a1a6d1abbbeb0b534b9d8b554549f0406ed2c' 
  AND token = '/a2OLiE7fnWfmnJrFEwXBgjU+SNJ877Qapij2Fz06zI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}